Reactive azo dyes with an aminonaphthalenesulfonic acid coupling component and intermediates therefor

ABSTRACT

Reactive dyes of the formula ##STR1## where n is 1 or 2, 
     G 1  is hydrogen or hydroxyl, 
     G 2  is hydrogen or hydroxysulfonyl, 
     G 3  is hydrogen or arylazo, 
     R 1  is hydrogen or hydroxysulfonylmethyl, 
     R 2  is hydrogen or hydroxysulfonylmethyl, and 
     D is the radical of a diazo or tetraazo component having in each case at least one anchor radical of the formula SO 2  --Y, where Y is vinyl or substituted ethyl, 
     their use for dyeing or printing hydroxyl-containing or nitrogenous organic substrates, and naphthylamines as intermediates therefor.

This application is a 371 of PCT/EP97/00013 filed Jan. 3, 1997.

The present invention relates to novel reactive dyes of the formula I ##STR2## where n is 1 or 2,

G¹ is hydrogen or hydroxyl,

G² is hydrogen or hydroxysulfonyl,

G³ is hydrogen or a radical of the formula ##STR3## R¹ is hydrogen or hydroxysulfonylmethyl, R² is hydrogen or hydroxyfonlymethyl, and

D is, when n is 1, a radical of the formula ##STR4## or, when n is 2, a radical of the formula ##STR5## where the ring A may be benzofused, R³, R⁴ and R⁵ are each independently of the others hydrogen, C₁ -C₄ -alkyl, C₁ -C₄ -alkoxy, halogen or hydroxysulfonyl, E is hydrogen, a heterocyclic anchor radical or a anchor radical of the aliphatic series, Y is vinyl or a radical of the formula C₂ H₄ --Q, where Q is an alkali-detachable group, and T is a bridge member,

with the proviso that at least one hydroxysulfonylmethyl group shall be present in the molecule and that dyes of the formula ##STR6## where n, D and G² are each as defined above, shall be excluded, to their use for dyeing or printing hydroxyl-containing or nitrogenous organic substrates and to naphthylamines as intermediates therefor.

The above-excluded dyes and intermediates are known from prior patent application WO 9610610.

It is an object of the present invention to provide novel reactive dyes derived from phenyl- or naphthalene-azo-naphthalene dyes. The novel dyes shall have an advantageous application property profile.

We have found that this object is achieved by the reactive dyes of the formula I defined at the beginning.

The novel reactive dyes of the formula I are each indicated in the form of the free acid, but salts thereof are also encompassed by the claims, of course.

Suitable cations are derived from metal or ammonium ions. Metal ions are in particular the lithium, sodium or potassium ions. Ammonium ions for the purposes of the present invention are substituted or unsubstituted ammonium cations. Substituted ammonium cations include for example monoalkyl-, dialkyl-, trialkyl-, tetraalkyl- or benzyltrialkyl-ammonium cations or cations derived from nitrogenous five- or six-membered saturated heterocycles, such as pyrrolidinium, piperidinium, morpholinium or piperazinium cations or their N-monoalkyl- or N,N-dialkyl-substituted products. Alkyl is generally to be understood as meaning straight-chain or branched C₁ -C₂₀ -alkyl which may be substituted by 1 or 2 hydroxyl groups and/or interrupted by from 1 to 4 oxygen atoms in ether function.

Any alkyl or alkylene herein can be straight-chain or branched.

Any substituted alkyl herein generally contains 1 or 2 substituents.

Any substituted phenylene herein contains for example, unless otherwise stated, C₁ -C₄ -alkyl, C₁ -C₄ -alkoxy, halogen, hydroxysulfonyl, sulfamoyl or mono- or di-C₁ -C₄ -alkylsulfamoyl as substituents. Substituted phenylene then generally contains from 1 to 3, preferably 1 or 2, substituents.

R³, R⁴ and R⁵ are each for example methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, fluorine, chlorine or bromine.

Q is an alkali-detachable group. Such groups include for example chlorine, bromine, C_(l) -C₄ -alkylsulfonyl, phenylsulfonyl, OSO₃ H, SSO₃ H, OP(O) (OH)₂, C₁ -C₄ -alkylsulfonyloxy, substituted or unsubstituted phenylsulfonyloxy, C₁ -C₄ -alkanoyloxy, C₁ -C₄ -dialkylamino or a radical of the formula ##STR7## where L¹, L² and L³ are each independently of the others C₁ -C₄ -alkyl or benzyl and An.sup.Θ is in each case one equivalent of an anion. Suitable anions include for example fluoride, chloride, bromide, iodide, mono-, di- or trichloroacetate, methanesulfonate, benzenesulfonate or 2- or 4-methylbenzenesulfonate.

Anchor radical E undergo substitutive or additive reactions with the hydroxyl or nitrogenous groups of the substrates to be treated.

The fact that the anchor radical reacts substitutively with the relevant groups in the substrates, for example with the hydroxyl groups of cellulose, means that the leaving groups or atoms (eg. fluorine or chlorine) in the anchor radical are replaced by the hydroxyl groups of the cellulose as per the following scheme: ##STR8##

The fact that the anchor radical reacts additively with the relevant groups in the substrates, for example with the hydroxyl groups of cellulose, means that the hydroxyl groups of the cellulose are added to the anchor radical as per the following scheme: ##STR9##

Heterocyclic anchor radicals E include for example halogen-containing radicals derived from the following basic heterocyclic species: 1,3,5-triazine, quinoxaline, phthalazine, pyrimidine or pyridazine or the 2-alkylsulfonylbenzothiazole radical.

The following are particularly suitable heterocyclic radicals: ##STR10## where X is hydrogen or C₁ -C₄ -alkyl,

Hal is fluorine or chlorine,

U¹ is hydrogen or nitro, and

U² and U³ are each independently of the other hydrogen, C₁ -C₆ -alkyl with or without substitution by hydroxyl, halogen, cyano, hydroxysulfonyl or a radical of the formula --SO₂ --Y, where Y is as defined above, and with or without interruption by one or two oxygen atoms in ether function or nonadjacent imino or C₁ -C₄ -alkylimino groups, or

U² and U³ are together with the nitrogen atom joining them together pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl or N-(C₁ -C₄ -alkyl)piperazinyl,

or else U² may also be a radical of the formula ##STR11## in which case the rings B and K may each be singly or doubly hydroxysulfonyl-substituted and/or benzofused and ring K may independently be monosubstituted or disubstituted by chlorine, nitro, C₁ -C₄ -alkyl, C₁ -C₄ -alkoxy, cyano, carboxyl, acetylamino, hydroxysulfonylmethyl or a radical of the formula CH₂ --SO₂ --Y, SO₂ --Y, NH--CO--Y or NU² --CO--NU² --Z--SO₂ --Y, where Y and U² are each as defined above and Z is C₂ -C₆ -alkylene with or without substitution by hydroxyl, chlorine, cyano, carboxyl, C₁ -C₄ -alkoxycarbonyl, C₁ -C₄ -alkanoyloxy or sulfato and with or without interruption by 1 or 2 oxygen atoms in ether function or nonadjacent imino or C₁ -C₄ -alkylimino groups.

Aliphatic anchor radicals E include for example acryloyl, mono-, di- or trichloroacryloyl, mono-, di- or tribromoacryloyl, --CO--CCl═CH--COOH, --CO--CH═CCl--COOH, 2-chloropropionyl, 1,2-dichloropropionyl, 1,2-dibromopropionyl, 3-phenylsulfonylpropionyl, 3-methylsulfonylpropionyl, 2-sulfatoethylaminosulfonyl, 2,3,3-trifluoro-2-chlorocyclobutylcarbonyl, 2,2,3,3-tetrafluorocyclobutylcarbonyl, 2,2,3,3-tetrafluorocyclobutylsulfonyl, 2-(2,2,3,3-tetrafluorocyclobutyl)acryloyl, 1- or 2-alkyl- or 1- or 2-aryl-sulfonylacryloyl, such as 1- or 2-methylsulfonylacryloyl, or a radical of the formula SO₂ --Y, W¹ --SO₂ --Y, CONX--W² --SO₂ --Y or NXCONX--W² --SO₂ --Y, where X and Y are each as defined above, W¹ is C₁ -C₄ -alkylene and W² is C₁ -C₄ -alkylene or substituted or unsubstituted phenylene.

W¹ and W² are each for example CH₂, (CH₂)₂, (CH₂)₃, (CH₂)₄, CH(CH₃)CH₂ or CH(CH₃)CH(CH₃).

W² may further be for example 1,2-, 1,3- or 1,4-phenylene.

T in the formula I is a bridge member. Suitable bridge members conform for example to the formula ##STR12## where p is 0 or 1 and Hal, W², X and Z are each as defined above.

Particularly suitable bridge members are radicals of the formula ##STR13## of which CO and SO₂ are preferred.

When n is 2, D preferably conforms to the formula ##STR14## where E, Y and T are each as defined above.

Preference is given to reactive dyes of the formula I where R³, R⁴ and R⁵ are each hydrogen.

Preference is further given to reactive dyes of the formula I where E is hydrogen, a anchor radicals of the 1,3,5-triazine series or a radical of the formula SO₂ --Y, where Y is as defined above.

Preference is further given to reactive dyes of the formula I where T is a radical of the formula CO or SO₂ when n is 2.

Preference is further given to reactive dyes of the formula I where n is 1.

Preference is further given to reactive dyes of the formula I where the ring A is not benzofused.

Preference is further given to reactive dyes of the formula Ia ##STR15## where n and D are each as defined above.

Preference is further given to reactive dyes of the formula Ib ##STR16## where n, D, G² and R¹ are each as defined above.

Preference is further given to reactive dyes of the formula Ic ##STR17## where n, D and R² are each as defined above.

Preference is further given to reactive dyes of the formula Id ##STR18## where G³ is a radical of the formula ##STR19## and n, D, the ring A, E, R³, R⁴, R⁵ and Y are each as defined above.

Particular preference is given to reactive dyes of the formula I where E is hydrogen or a radical of the formula SO₂ --Y, where Y is as defined above.

Particular preference is further given to reactive dyes of the formula I, in particular of the formulae I a-d, where the radical of the formula SO₂ --Y is disposed ortho to the azo group.

The novel reactive dyes of the formula I are obtainable in a conventional manner.

For example, an aniline of the formula IIa or IIb ##STR20## where the ring A, R³, R⁴, R⁵, E, Y and T are each as defined above, can be diazotized or tetraazotized in a conventional manner and coupled with aminonaphthalene of the formula III ##STR21## where G¹, G², R¹ and R² are each as defined above.

The anilines of the formula IIb are obtainable in a conventional manner, for example as described in prior patent application DE-A-195 08 311.

The present invention further provides naphthylamines of the formula III ##STR22## where G¹ is hydrogen or hydroxyl,

G² is hydrogen or hydroxysulfonyl,

R¹ is hydrogen or hydroxysulfonylmethyl, and

R² is hydrogen or hydroxysulfonylmethyl

with the proviso that at least one hydroxysulfonylmethyl group shall be present in the molecule, and that naphthylamines of the formula ##STR23## where G² is as defined above, shall be excluded.

Preference is given to naphthylamines of the formulae IIIa to IIIc ##STR24## where G², R¹ and R² are each as defined above.

The novel naphthylamines of the formula III are obtainable in a conventional manner.

For example, a naphthylene derivative of the formula IV ##STR25## where G¹ and G² are each as defined above, can be reacted in a basic medium with the addition product of an alkali metal bisulfite with formaldehyde, eg. formaldehyde sodium bisulfite of the formula HOCH₂ SO₃ Na.

By partial hydrolysis in the alkaline region the hydroxysulfonylamino group can also be converted back into the free amino group.

The novel reactive dyes of the formula I are advantageously useful for dyeing or printing hydroxyl-containing or nitrogenous organic substrates. Such substrates include for example leather or fiber material predominantly comprising natural or synthetic polyamides or natural or regenerated cellulose. The novel dyes are preferably useful for dyeing and printing textile material based on wool and in particular on cotton. The dyeings obtained have red shades.

Cellulose-based substrates in particular are dyed with a very high yield of fixation in strong dyeings having very good lightfastness and also excellent wetfastness properties, such as wash, chlorine bleach, peroxide bleach, alkali, seawater or perspiration fastness properties.

The Examples which follow illustrate the invention.

EXAMPLE 1

a) 149 g (0.5 mol) of 2-aminonaphthalene-5-sulfonic acid were suspended in 750 ml of water and dissolved by adding sodium hydroxide solution. 106 g (0.75 mol) of formaldehyde sodium bisulfite were added at pH 6.5 a little at a time and the mixture was stirred at 60° C. for 4 h. 200 g of sodium chloride were added to precipitate the product of the formula ##STR26## to obtain 449 g (0.4 mol) of a moist paste.

b) 15 g (0.05 mol) of 4-(2-sulfatoethylsulfonyl)aniline were suspended in 200 ml of ice-water, admixed with 15 ml of 10N hydrochloric acid and diazotized at 0-5° C. by the dropwise addition of 15 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at 0-5° C. for 2 hours, the small excess of nitrous acid was destroyed with sulfamic acid. To this solution were added 56 g (0.05 mol) of the compound described under a), and the reaction solution was held at a pH of from 2.5 to 3 with sodium acetate. After the reaction had ended, the reaction mixture was warmed to room temperature, and the pH was adjusted to 5-5.5 with sodium carbonate. 300 ml of methanol and 2 l of acetone were added to obtain 27 g (0.044 mol) of the scarlet dye of the formula ##STR27##

The following dyes were obtained in a similar manner:

EXAMPLE 2 ##STR28## EXAMPLE 3 ##STR29## EXAMPLE 4 ##STR30## EXAMPLE 5 ##STR31## EXAMPLE 6

a) 207 g (0.5 mol) of 2-amino-8-hydroxynaphthalene-3,6-disulfonic acid were suspended in 750 ml of water and dissolved by adding sodium hydroxide solution. 176.5 g (1.25 mol) of formaldehyde sodium bisulfite were added at pH 8.5 a little at a time and the mixture was stirred at 60° C. for 20 h. 350 g of potassium chloride were added to precipitate the product of the formula ##STR32## to obtain 523 g of a moist paste.

b) 523 g of the compound prepared under a) were suspended in 800 ml of water and admixed with 75 ml (1.35 mol) of aqueous sodium hydroxide solution and stirred at 80° C. for 7 h. After the reaction had ended, a pH of 3 was set with dilute hydrochloric acid and the dye was salted out with 300 g of potassium chloride to obtain 182.5 g (0.35 mol) of a beige solid of the formula ##STR33##

c) 25 g (0.05 mol) of 3-(2-sulfatoethylsulfonyl)aniline-4,6-disulfonic acid were suspended in 200 ml of ice-water, admixed with 15 ml of 10N hydrochloric acid and diazotized at 0-5° C. by the dropwise addition of 15 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at from 0 to 5° C. for 3 hours, the small excess of nitrous acid was destroyed with sulfamic acid. To this solution were added 26 g (0.05 mol) of the compound described under b), and the reaction solution was held at a pH of from 2.5 to 3 with sodium acetate. After the reaction had ended, the reaction mixture was warmed to room temperature, and the pH was adjusted to 5-5.5 with sodium bicarbonate. Precipitation with a methanol/acetone mixture yielded 38.3 g (0.044 mol) of a reddish violet dye of the formula ##STR34##

The following dyes were obtained in a similar manner:

EXAMPLE 7 ##STR35## EXAMPLE 8 ##STR36## EXAMPLE 9 ##STR37## EXAMPLE 10

a) 129 g (0.5 mol) of 2-amino-8-hydroxynaphthalene-6-sulfonic acid were suspended in 750 ml of water and dissolved with sodium hydroxide solution. 176.3 g (1.25 mol) of formaldehyde sodium bisulfite were added a little at a time at pH 8-8.5 and the mixture was stirred at 60° C. for 9 h. After the reaction had ended, the product was precipitated with 300 g of sodium chloride to obtain 447 g (0.41 mol) of a beige solid of the formula ##STR38##

b) 15 g (0.05 mol) of 2-(2-sulfatoethylsulfonyl)aniline were suspended in 200 ml of ice-water, admixed with 20 ml of 10N hydrochloric acid and diazotized at 0-5° C. by the dropwise addition of 15 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at 0-5° C. for 2 hours, the small excess of nitrous acid was destroyed with sulfamic acid. To this solution were added 55 g (0.05 mol) of the compound described under a), and the reaction solution was held at a pH of from 2.5 to 3 with sodium acetate. After the reaction had ended, the reaction mixture was warmed to room temperature, and the pH was adjusted to 5-5.5 with sodium bicarbonate. Precipitating with the methanol/acetone mixture yielded 37.9 g (0.047 mol) of a reddish violet dye of the formula ##STR39##

The following dyes were obtained in a similar manner:

EXAMPLE 11 ##STR40## EXAMPLE 12 ##STR41## EXAMPLE 13 ##STR42## EXAMPLE 14 ##STR43## EXAMPLE 15

a) 129 g (0.5 mol) of 2-amino-8-hydroxynaphthalene-6-sulfonic acid were suspended in 750 ml of water and dissolved with sodium hydroxide solution. 176.3 g (1.25 mol) of formaldehyde sodium bisulfite were added a little at a time at pH 8-8.5 and the mixture was stirred at 60° C. for 9 h. After the reaction had ended, 137.5 ml (2.5 mol) of 50% strength by weight sodium hydroxide solution were added and the mixture was heated at 90° C. for 1.5 h. Thereafter it was adjusted to pH 5 with dilute hydrochloric acid, and the precipitate was filtered off. The paste was suspended in 800 ml of water and admixed with 100 ml of saturated aqueous sodium chloride solution to obtain 208 g (0.358 mol) of a moist paste of the formula ##STR44##

b) 13.5 g (0.045 mol) of 2-(2-sulfatoethylsulfonyl)aniline were suspended in 200 ml of ice-water, admixed with 20 ml of 10N hydrochloric acid and diazotized at 0-5° C. by the dropwise addition of 13.5 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at 0-5° C. for 2 hours, the small excess of nitrous acid was destroyed with sulfamic acid. To this solution were added 31 g (0.045 mol) of the compound prepared under a), and the reaction solution was held at a pH of from 3.5 to 4 with sodium acetate. After the reaction had ended, the reaction mixture was warmed to room temperature, and the pH was adjusted to 5-5.5 with sodium bicarbonate. The product was precipitated by adding 100 g of sodium chloride to obtain 34 g (0.041 mol) of a red dye of the formula ##STR45##

The following dyes were obtained in a similar manner:

EXAMPLE 16 ##STR46## EXAMPLE 17 ##STR47## EXAMPLE 18 ##STR48## EXAMPLE 19

a) 386 g (1.5 mol) of 2-amino-5-hydroxynaphthalene-7-sulfonic acid were suspended in 2250 ml of water and dissolved with sodium hydroxide solution. 318 g (2.25 mol) of formaldehyde sodium bisulfite were added at pH 5 and the mixture was stirred at 60° C. for 4 h. After the reaction had ended, the resulting product of the formula ##STR49## was not isolated but used as a coupling component in solution.

b) 14.5 g (0.05 mol) of 3-(2-sulfatoethylsulfonyl)aniline were suspended in 200 ml of ice-water, admixed with 20 ml of 10N hydrochloric acid and diazotized at 0-5° C. by dropwise addition of 15 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at 0-5° C. for 3 hours, the small excess of nitrous acid was destroyed with sulfamic acid.

106 ml (0.053 mol) of the solution described under a) were admixed with ice and adjusted to pH 3 with dilute hydrochloric acid. The diazonium salt solution was added dropwise to this solution while a pH of 2.5-3 was maintained with sodium acetate. After the reaction had ended, the mixture was warmed to room temperature and the pH was adjusted to 5-5.5 with sodium bicarbonate. The dye was precipitated by adding 150 g of potassium chloride and 50 g of sodium chloride. Filtration left 37.5 g (0.048 mol) of a scarlet dye of the formula ##STR50##

The following dyes were obtained in a similar manner:

EXAMPLE 20 ##STR51## EXAMPLE 21 ##STR52## EXAMPLE 22

a) 2 l (1.0 mol) of the solution described in Example 19a) were adjusted to pH 8.5 with sodium hydroxide solution and heated to 60° C. At that temperature, 70.5 g (0.05 mol) of formaldehyde sodium bisulfite were added and the mixture was stirred at 60° C. for 2 hours. After the reaction had ended, the resulting compound of the formula ##STR53## was not isolated but used in solution as coupling component.

b) 14.5 g (0.05 mol) of 3-(2-sulfatoethylsulfonyl)aniline were suspended in 200 ml of ice-water, admixed with 20 ml of 10N hydrochloric acid and diazotized at 0-5° C. by dropwise addition of 15 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at 0-5° C. for 3 hours, the small excess of nitrous acid was destroyed with sulfamic acid.

112 ml (0.053 mol) of the solution described under a) were admixed with ice and adjusted to pH 3 with dilute hydrochloric acid. The diazonium salt solution was added dropwise to this solution while a pH of 2.5-3 was maintained with sodium acetate. After the reaction had ended, the mixture was warmed to room temperature and the pH was adjusted to 5-5.5 with sodium bicarbonate. The dye was precipitated by adding 200 g of sodium chloride. Filtration left 47.8 g (0.045 mol) of a scarlet dye of the formula ##STR54##

The following dyes were obtained in a similar manner:

EXAMPLE 23 ##STR55## EXAMPLE 24 ##STR56## EXAMPLE 25

a) 1.05 l (0.5 mol) of the solution described in Example 22 a) were heated to 60° C. and admixed a little at a time at that reaction temperature with a total of 137.5 ml (2.5 mol) of 50% strength by weight sodium hydroxide solution. After the reaction had ended, the pH was adjusted to 5 with dilute hydrochloric acid and 200 g of sodium chloride were added to isolate 497 g (0.33 mol) of moist paste of the formula ##STR57##

b) 14.5 g (0.05 mol) of 3-(2-sulfatoethylsulfonyl)aniline were suspended in 200 ml of ice-water, admixed with 20 ml of 10N hydrochloric acid and diazotized at 0-5° C. by the dropwise addition of 15 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at 0-5° C. for 2 hours, the small excess of nitrous acid was destroyed with sulfamic acid. To this solution were added 74 g (0.05 mol) of the compound prepared under a) and the reaction solution was held at pH 3.5-4 with sodium acetate. After the reaction had ended, the mixture was warmed to room temperature and the pH was adjusted to 5-5.5 with sodium bicarbonate. Precipitating with a methanol/ethanol mixture yielded 35.1 g (0.042 mol) of the dye of the formula ##STR58##

The following dye was obtained in a similar manner:

EXAMPLE 26 ##STR59## EXAMPLE 27

35.3 g (0.075 mol) of 3-(2-sulfatoethylsulfonyl)aniline-4,6-disulfonic acid were suspended in 300 ml of ice-water, admixed with 30 ml of 10N hydrochloric acid and diazotized at 0-5° C. by dropwise addition of 22.5 ml of 23% strength by weight aqueous sodium nitrite solution with stirring. After stirring at 0-5° C. for 2 hours, the small excess of nitrous acid was destroyed with sulfamic acid. 70 ml (0.035 mol) of the solution described in Example 19 a) were admixed with ice and adjusted to pH 3 with dilute hydrochloric acid. Half the diazonium salt solution was added dropwise to this solution while the pH was held within the range from 2.5 to 3 with sodium acetate. After the coupling in the ortho position to the amino group was complete, the pH was raised to 5-5.5 and the rest of the diazonium salt solution was added dropwise. Precipitating with methanol/ethanol mixture yielded 50.3 g (0.034 mol) of a scarlet dye of the formula ##STR60##

The following dyes were obtained in a similar manner:

EXAMPLE 28 ##STR61## EXAMPLE 29 ##STR62## EXAMPLE 30 ##STR63## EXAMPLE 31 ##STR64## EXAMPLE 32 ##STR65## EXAMPLE 33 ##STR66## EXAMPLE 34 ##STR67## EXAMPLE 35 ##STR68## EXAMPLE 36 ##STR69## 

We claim:
 1. A reactive dye of the formula I wheren is 1 or 2, G¹ is hydrogen or hydroxyl, G² is hydrogen or hydroxysulfonyl, G³ is hydrogen or a radical of the formula ##STR70## R¹ is hydrogen or hydroxysulfonylmethyl, R² is hydrogen or hydroxysulfonylmethyl, and D is, when n is 1, a radical of the formula ##STR71## or, when n is 2, a radical of the formula ##STR72## where the ring A may be benzofused, R³, R⁴ and R⁵ are each independently of the others hydrogen, C₁ -C₄ -alkyl, C₁ -C₄ -alkoxy, halogen or hydroxysulfonyl, E is hydrogen, a heterocyclic anchor radical or a anchor radical of the aliphatic series, Y is vinyl or a radical of the formula C₂ H₄ --Q, where Q is an alkali-detachable group, and T is a bridge member,with the proviso that at least one hydroxysulfonylmethyl group shall be present in the molecule and that dyes of the formula ##STR73## where n, D, G⁷ and G² are each as defined above, shall be excluded.
 2. The reactive dye as claimed in claim 1 which conform to the formula Ia ##STR74## where n and D are each as defined in claim
 1. 3. The reactive dye as claimed in claim 1 which conform to the formula Ib ##STR75## where n, D, G² and R¹ are each as defined in claim
 1. 4. The reactive dye as claimed in claim 1 which conform to the fomula Ic ##STR76## where n, D and R² are each as defined in claim
 1. 5. The reactive dye as claimed in claim 1 which conform to the formula Id ##STR77## where G³ is a radical of the formula ##STR78## and n, D, the ring A, E, R³, R⁴, R⁵, G² and Y are each as defined in claim
 1. 6. The reactive dye as claimed in claim 1, wherein R³, R⁴ and R⁵ are each hydrogen.
 7. The reactive dye as claimed in claim 1, wherein T is a radical of the formula CO or SO₂ when n is
 2. 8. The reactive dye as claimed in claim 1, wherein n is
 1. 9. The reactive dye as claimed in claim 1, wherein E is hydrogen or a radical of the formula SO₂ --Y, where Y is as defined in claim
 1. 10. The reactive dye as claimed in claim 1, wherein the radical of the formula SO₂ --Y is ortho to the azo group.
 11. A method for dyeing or printing a hydroxyl-containing or nitrogenous organic substrate comprising applying the reactive dye of claim 1 to said substrate. 